KR20210066691A - An wireless communication apparatus that controls a transmission power of sounding reference signal for channel reciprocity and an wireless communication system including the same - Google Patents

Abstract

According to an exemplary embodiment of the present invention, an operating method of a wireless communication device performing wireless communication with a cell comprises the following steps of: checking an electric field state from a downlink signal received from a cell; selecting a power compensation mode for transmission power of a sounding reference signal based on the checked electric field state; compensating for transmission power for each antenna for transmission of the sounding reference signal based on the selected power compensation mode; and sequentially transmitting the sounding reference signal to the cell for each antenna based on the compensated transmission power for each antenna.

Description

A wireless communication device for controlling the transmission power of a sounding reference signal for channel reciprocity, and a wireless communication system including the same

The present disclosure relates to a wireless communication device and a wireless communication system, and more particularly, to a wireless communication device and a wireless communication system for performing wireless communication based on channel reciprocity.

Beam forming may refer to a method of transmitting signals having directionality using a plurality of antennas. For example, a cell may transmit a downlink signal to a wireless communication device based on a beamforming method. Considering that the radio channel is reciprocal between the uplink and the downlink between the cell and the wireless communication device, it can be assumed that the state of the uplink channel and the state of the downlink channel are the same or similar to each other. Meanwhile, the above channel reciprocity may be effective in a time division duplex (TDD) system in which the uplink and the downlink share the same frequency spectrum and are separated in the time domain.

The cell may receive a sounding reference signal transmitted through at least one antenna frame of the wireless communication device. For example, when the wireless communication device includes a plurality of antennas, the plurality of antennas may be sequentially selected to transmit a sounding reference signal to a cell, respectively. The cell may estimate an uplink channel for each antenna of the wireless communication device and perform beamforming for downlink signal transmission using the estimated uplink channel in consideration of channel reciprocity.

A sounding reference signal is mainly used for channel quality measurement in order to perform frequency-selective scheduling of an uplink, and does not include uplink data or control information. However, the sounding reference signal may be used for various purposes to improve power control or to support various start-up functions of wireless communication devices that have not been scheduled recently.

In order to maximize the effect of beamforming-based wireless communication based on channel reciprocity, it is necessary to accurately estimate the uplink channel. To this end, it is important for the cell to receive a sounding reference signal fully reflecting the uplink channel state. .

An object of the present disclosure is to provide a wireless communication device and a wireless communication system that perform an operation for improving the performance of wireless communication based on channel reciprocity.

A method of operating a wireless communication device for performing wireless communication with a cell according to an exemplary embodiment of the present disclosure includes: checking an electric field state from a downlink signal received from the cell; Selecting a power compensation mode for transmission power of a sounding reference signal, compensating for transmission power for each antenna for transmission of the sounding reference signal based on the selected power compensation mode, and the compensated antenna and sequentially transmitting the sounding reference signal to the cell for each antenna based on the respective transmit power.

A method of operating a cell performing wireless communication with a wireless communication device according to an exemplary embodiment of the present disclosure includes estimating a downlink channel for each antenna of the wireless communication device from an uplink signal received from the wireless communication device; Checking the electric field state of the wireless communication device, adjusting the estimated downlink channel for each antenna based on the checked electric field state, calculating a beamforming matrix based on the adjusted downlink channel for each antenna and transmitting a downlink signal generated based on the calculated beamforming matrix to a wireless communication device.

In accordance with an exemplary embodiment of the present disclosure, there is provided a method of operating a wireless communication system including a cell and a wireless communication device that communicate with each other, the wireless communication device comprising: checking an electric field state from a downlink signal received from the cell; When the checked electric field state is a strong electric field, the wireless communication device generates a second transmission power compensation parameter corresponding to an internal path loss for each antenna and a received power compensation parameter corresponding to a downlink channel state for each antenna. 2 Compensating for transmit power for each antenna for transmitting a sounding reference signal using a transmit power compensation parameter, and the wireless communication device transmits the sounding reference signal to the cell based on the compensated transmit power for each antenna sending it.

A wireless communication device according to an exemplary embodiment of the present disclosure includes a plurality of antennas, a plurality of power amplifiers configured to be respectively connected to the plurality of antennas, and transmission of the plurality of antennas for each antenna through the plurality of power amplifiers. a processor configured to control power, wherein the processor determines an electric field state from a downlink signal received from a cell through the plurality of antennas, and adjusts the transmit power of the sounding reference signal based on the identified electric field state. and selects a power compensation mode for each antenna, and compensates the transmission power for each antenna with respect to the sounding reference signal based on the selected power compensation mode.

The wireless communication system according to an exemplary embodiment of the present disclosure provides channel reciprocity by compensating for the transmission power of a sounding reference signal in consideration of the electric field state of the wireless communication device or adjusting the estimated downlink channel for each antenna of the wireless communication device. There is an effect of creating a satisfactory environment and performing beamforming-based communication with improved performance.

Effects that can be obtained in the exemplary embodiments of the present disclosure are not limited to the above-mentioned effects, and other effects not mentioned are common knowledge in the art to which exemplary embodiments of the present disclosure pertain from the following description. It can be clearly derived and understood by those who have That is, unintended effects of carrying out the exemplary embodiments of the present disclosure may also be derived by those of ordinary skill in the art from the exemplary embodiments of the present disclosure.

1A is a block diagram schematically showing a wireless communication system according to an exemplary embodiment of the present disclosure, and FIGS. 1B and 1C are diagrams for explaining a radio channel between the wireless communication device of FIG. 1A and a cell.
2 is a block diagram illustrating a wireless communication device according to an exemplary embodiment of the present disclosure.
3 is a block diagram illustrating the SRS transmit power controller of FIG. 2 .
4 is a flowchart illustrating an operating method of a wireless communication system according to an exemplary embodiment of the present disclosure.
5A and 5B are graphs for explaining the magnitude of noise in a strong electric field and a weak electric field of a wireless communication device.
6 is a flowchart specifically illustrating step S110 of FIG. 4 .
7 is a flowchart specifically illustrating step S120 of FIG. 4 .
8 is a block diagram referenced to describe a method of compensating for transmission power of a sounding reference signal for each antenna according to an exemplary embodiment of the present disclosure.
FIG. 9 is a table diagram for explaining a power compensation parameter corresponding to each of the antennas of FIG. 8 .
FIG. 10 is a flowchart for describing in detail the operation of the power compensation parameter calculator of FIG. 2 .
11 is a block diagram illustrating a wireless communication system according to an exemplary embodiment of the present disclosure.
12 is a flowchart illustrating an operating method of a wireless communication system according to an exemplary embodiment of the present disclosure.
FIG. 13 is a diagram for explaining an operation of the estimation channel adjustment circuit of FIG. 11 .
14 is a block diagram illustrating an electronic device supporting a transmission power compensation function of a sounding reference signal according to an exemplary embodiment of the present disclosure.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1A is a block diagram schematically showing a wireless communication system 10 according to an exemplary embodiment of the present disclosure, and FIGS. 1B and 1C are a wireless channel between the wireless communication device 100 and the cell 110 of FIG. 1A. It is a drawing for explanation.

The wireless communication system 10 is a New Radio (NR) system, a 5 ^th generation wireless (5G) system, a Long Term Evolution (LTE) system, an LTE-Advanced system, a Code Division Multiple (CDMA) system, a GSM system (Global System for Mobile Communication), it may be any one of a wireless local area network (WLAN) system. In addition, a CDMA system can be implemented with various versions of CDMA, such as Wideband CDMA (WCDMA), Time Division Synchronization CDMA (TD-SCDMA), and cdma2000. Hereinafter, the wireless communication system 10 will be mainly described with reference to a 5G system and/or an LTE system, but it will be understood that exemplary embodiments of the present disclosure are not limited thereto.

The wireless communication network of the wireless communication system 10 may support multiple users to communicate by sharing available network resources. For example, in a wireless communication network, Code Division Multiple Access (CDMA), Frequency Division Multiple Access (FDMA), Time Division Multiple Access (TDMA), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple (SC-FDMA), Access), OFDM-FDMA, OFDM-TDMA, OFDM-CDMA, and the like, information can be transmitted in various multiple access methods.

In some embodiments, the wireless communication device 100 may be a cell or a user equipment (UE) in the wireless communication system 10 . A cell may generally refer to a fixed station that communicates with user equipment and/or other cells, and may exchange data and control information by communicating with user equipment and/or other cells. For example, a cell includes a base station (BS), a Node B, an evolved-Node B (eNB), a sector, a site, a base transceiver system (BTS), an access pint (AP), and a relay node. (Relay Node), RRH (Remote Radio Head), RU (Radio Unit), may also be referred to as a small cell (small cell). In this specification, a cell or base station may be interpreted as a generic meaning indicating some areas or functions covered by a Base Station Controller (BSC) in CDMA, Node-B in WCDMA, an eNB or a sector (site) in LTE, etc. In addition, it can cover various coverage areas such as megacells, macrocells, microcells, picocells, femtocells and relay nodes, RRHs, RUs, and small cell communication ranges.

User equipment may be fixed or mobile, and may refer to various devices capable of transmitting and receiving data and/or control information by communicating with a base station. For example, the user equipment includes a terminal equipment, a mobile station (MS), a mobile terminal (MT), a user terminal (UT), a subscriber station (SS), a wireless device, and a handheld device. ) may be referred to as

Referring to FIG. 1A , the wireless communication system 10 may include a plurality of cells 110 and 112 and a system controller 120 . However, this is not limited to an exemplary embodiment, and the wireless communication system 10 may include a plurality of cells and a plurality of network entities. The cells 110 and 112 may communicate with the wireless communication device 100 or other cells to transmit/receive data signals or control information. The wireless communication device 100 may communicate with the wireless communication system 10 and may receive signals from the broadcast station 114 . Furthermore, the wireless communication device 100 may receive a signal from the satellite 130 of a global navigation satellite system (GNSS). The wireless communication device 100 may support a radio technology for various wireless communication.

The technical spirit of the present disclosure may be applied between communication entities forming an uplink channel and a downlink channel in the wireless communication system 10 . Hereinafter, the wireless communication device 100 and the cell 110 are mainly described as communication subjects to which the technical idea of the present disclosure is applied.

The wireless communication device 100 according to an exemplary embodiment of the present disclosure selects a power compensation mode based on the electric field state formed in the communication coverage area of the cell 110, and generates a sounding reference signal based on the selected power compensation mode. Transmission power for each antenna for transmission may be compensated. The electric field state of the wireless communication device 100 may be classified into a strong electric field and a weak electric field according to a preset reference value. However, in some embodiments, the electric field state of the wireless communication device 100 may be classified in detail by various reference values, and it is clear that the exemplary embodiment of the present disclosure may be applied to various classified electric field states.

In an exemplary embodiment, the wireless communication device 100 may operate in different power compensation modes in a strong electric field and a weak electric field, respectively. When the electric field state is confirmed to be a strong electric field, the wireless communication device 100 may operate in the first power compensation mode in which the transmit power for each antenna is compensated by considering the characteristics of the internal noise as a major factor. When the electric field state is confirmed to be a weak electric field, the wireless communication device 100 may operate in the second power compensation mode in which the transmit power for each antenna is compensated for by mainly considering the characteristics of external noise. The internal and external noise characteristics of the wireless communication device 100 in the strong electric field and the weak electric field will be described later with reference to FIGS. 5A and 5B .

The wireless communication device 100 may operate in a power compensation mode selected according to an electric field state and transmit a sounding reference signal to the cell 110 for each antenna based on the compensated transmission power for each antenna. For example, when the wireless communication apparatus 100 includes the first and second antennas, the wireless communication device 100 compensates for the transmission power of the sounding reference signal corresponding to the first antenna, and generates the sounding reference signal with the compensated transmission power. It can transmit to the cell 110 through one antenna. Thereafter, the wireless communication device 100 may compensate the transmission power of the sounding reference signal corresponding to the second antenna, and transmit the sounding reference signal to the cell 110 through the second antenna with the compensated transmission power. .

In an exemplary embodiment, the cell 110 may estimate a downlink channel for each antenna of the wireless communication device 100 based on a sounding reference signal received from the wireless communication device 100 . Specifically, the cell 110 may estimate an uplink channel for each antenna of the wireless communication device 100 using the received sounding reference signal, and the estimated uplink channel for each antenna is downlinked for each antenna according to channel reciprocity. A downlink channel for each antenna can be estimated by considering it to be the same as or similar to the link channel. The cell 110 may calculate a beamforming matrix based on the estimated downlink channel for each antenna. The cell 110 may transmit a downlink signal generated based on the calculated beamforming matrix to the wireless communication device 100 through a plurality of antennas.

On the other hand, the wireless communication device 100 may operate in the same power compensation mode when transmitting the sounding reference signal regardless of the electric field state, and at this time, the cell 110 is down for each antenna of the wireless communication device 100 . In estimating the link channel, a different operation may be performed depending on the electric field state of the wireless communication device 100 .

Specifically, the cell 110 may estimate a downlink channel for each antenna of the wireless communication device 100 from an uplink signal received from the wireless communication device 100 . The uplink signal may include a sounding reference signal transmitted for each antenna of the wireless communication device 100 . Furthermore, the uplink signal may include information indicating the quality of the downlink channel for each antenna of the wireless communication device 100 . The cell 110 estimates the downlink channel for each antenna of the wireless communication device 100 from the uplink signal, checks the electric field state of the wireless communication device 100, and the wireless communication device estimated based on the checked electric field state (100) It is possible to adjust the downlink channel for each antenna. The cell 110 calculates a beamforming matrix based on the adjusted downlink channel for each antenna, and transmits a downlink signal generated based on the calculated beamforming matrix to the wireless communication device 100 through a plurality of antennas. can That is, the cell 110 may adjust the estimated downlink channel for each antenna of the wireless communication device to satisfy the channel reciprocity in consideration of noise characteristics that vary depending on the electric field state of the wireless communication device 100 .

The wireless communication system 10 according to an exemplary embodiment of the present disclosure compensates the transmission power of the sounding reference signal in consideration of the electric field state of the wireless communication device 100 or estimates for each antenna of the wireless communication device 100 . By adjusting the downlink channel, it is possible to create an environment satisfying channel reciprocity and perform beamforming-based communication with improved performance.

Referring further to FIG. 1B , the wireless communication device 100 may include m antennas, and the cell 110 may include n antennas. The wireless communication device 100 and the cell 110 may perform mutual beamforming-based communication, MIMO (Multi-Input, Multi-Output)-based communication, and the like using respective antennas. Since the theoretical channel transmission capacity is increased through the configuration of FIG. 1B, it is possible to improve the transfer rate and remarkably improve the frequency efficiency.

Referring further to FIG. 1C , an uplink channel arriving from the j-th antenna (j-th antenna) of the wireless communication device 100 to the n antennas of the cell 110 may be expressed as follows.

[Equation 1]

은 셀(110)의 n개의 안테나들 각각에 대응하는 채널들(

)을 포함할 수 있다. 셀(110)은 무선 통신 장치(100)의 제j 안테나로부터 송신된 사운딩 참조 신호를 수신하고, 수신된 사운딩 참조 신호를 이용하여 업링크 채널

을 추정할 수 있다. 셀(110)은 채널 상호성을 고려하여 업링크 채널

로부터 다운링크 채널을 획득할 수 있으며, 획득한 다운링크 채널을 이용하여 다운링크 신호를 생성하고, n개의 안테나들 중 적어도 하나를 통해 다운링크 신호를 무선 통신 장치(100)에 송신할 수 있다.That is, the uplink channel corresponding to the j-th antenna of the wireless communication device 100 .

is the channel corresponding to each of the n antennas of the cell 110 (

) may be included. The cell 110 receives the sounding reference signal transmitted from the j-th antenna of the wireless communication device 100, and uses the received sounding reference signal for an uplink channel

can be estimated. Cell 110 considers the channel reciprocity, the uplink channel

It is possible to obtain a downlink channel from , generate a downlink signal using the obtained downlink channel, and transmit the downlink signal to the wireless communication device 100 through at least one of n antennas.

관련 내용은 무선 통신 장치(100)의 다른 안테나들에 대응하는 업링크 채널들에 적용될 수 있으며, 위의 내용을 바탕으로 이하에서 본 개시의 기술적 사상들을 서술한다.Uplink channel corresponding to the j-th antenna of the wireless communication device 100

Related content may be applied to uplink channels corresponding to other antennas of the wireless communication device 100, and the technical ideas of the present disclosure will be described below based on the above content.

2 is a block diagram illustrating a wireless communication device 100 according to an exemplary embodiment of the present disclosure.

Referring to FIG. 2 , the wireless communication device 100 includes first to m-th antennas 110_1 to 110_m, first to m-th radio frequency integrated circuits (RFICs) 130_1 to 130_m, and a baseband processor 150 . may include The first RFIC 130_1 may include an antenna interface circuit 132_1 , a transmission circuit 134_1 , and a reception circuit 136_1 . The antenna interface circuit 132_1 may connect the first antenna 110_1 to any one of the transmission circuit 134_1 and the reception circuit 136_1 . The transmitting circuit 134_1 converts the digital signal received from the baseband processor 150 into an analog signal, adjusts the frequency up to a desired frequency band, amplifies the analog signal through a power amplifier (PA), and then up It can be output as a link signal. The receiving circuit 136_1 amplifies the downlink signal received from the first antenna 110_1 through a low noise amplifier (LNA), downlinks the amplified downlink signal to a baseband band, and then digitally can be converted into a signal. The receiving circuit 136_1 may provide the converted digital signal to the baseband processor 150 . The above-described first RFIC (130_1) may also be applied to the configuration of the second to mth RFICs (130_2 to 130_m), the detailed description thereof will be omitted.

The baseband processor 150 according to an exemplary embodiment of the present disclosure may include an SRS transmit power controller 152 and a power compensation parameter calculator 154 . The SRS transmission power controller 152 may select a power compensation mode based on the electric field state of the wireless communication device 100 and compensate the transmission power for each antenna for transmitting the sounding reference signal based on the selected power compensation mode. have.

The SRS transmission power controller 152 may first determine the electric field state of the wireless communication device 100 . In an exemplary embodiment, the SRS transmit power controller 152 may measure a received signal strength from a downlink signal received through the first to mth antennas 110_1 to 110_m. For example, the SRS transmit power controller 152 may measure Reference Signal Received Power (RSRP) from a reference signal included in the downlink signal, and the received signal strength may include RSRP. In some embodiments, the received signal strength may include at least one of a Reference Signal Received Quality (RSRQ), a Signal-to-Interference-and-Noise Ratio (SINR), and a Received Signal Strength Indicator (RSSI).

The SRS transmit power controller 152 may compare the measured received signal strength with a reference value, and determine the electric field state of the wireless communication device 100 based on the comparison result. For example, when the measured received signal strength exceeds the reference value, the SRS transmission power controller 152 determines the electric field state of the wireless communication device 100 as a strong electric field, and when the measured received signal strength is less than or equal to the reference value, the SRS The transmission power controller 152 may determine the electric field state of the wireless communication device 100 as a weak electric field.

The SRS transmit power controller 152 compensates for transmit power for each antenna for transmitting the sounding reference signal using the second transmit power compensation parameter generated using the first transmit power compensation parameter and the receive power compensation parameter in the strong electric field. can do. The SRS transmit power controller 152 may compensate the transmit power for each antenna for transmitting the sounding reference signal by using the first transmit power compensation parameter in the weak electric field. The first transmission power compensation parameter may correspond to a parameter corresponding to an internal path loss for each antenna. Specifically, the internal path loss for each antenna may include losses corresponding to respective paths from the first to mth antennas 110_1 to 110_m to the respective power amplifiers PA.

For example, the SRS transmit power controller 152 sets the power amplifier PA and the j-th antenna 110_j to the reference power to compensate for the transmit power of the sounding reference signal transmitted through the j-th antenna 110_j in the weak electric field. ), a first transmission power compensation parameter corresponding to the internal path loss between ) may be applied. The SRS transmit power controller 152 in the weak electric field may compensate the transmit power for each antenna as follows.

[Equation 2]

)에 기준 전력(

) 및 제1 송신 전력 보상 파라미터(

)를 곱하여 제j 안테나(110_j)를 통해 출력 신호(

)를 송신할 수 있다. 예시적 실시 예로, 내부 경로 손실에 제1 송신 전력 보상 파라미터가 비례할 수 있으며, 위와 같은 SRS 송신 전력 컨트롤러(152)의 보상 동작을 통해 제1 내지 제m 안테나(110_1~110_m)를 통해 순차적으로 출력되는 사운딩 참조 신호들은 상호 동일 또는 유사한 전력을 가질 수 있다. 한편, [수학식 2]에서 기준 전력(

)은 미리 설정된 것으로 제1 내지 제m 안테나(110_1~110_m)에 모두 동일하게 적용될 수 있다.SRS transmit power controller 152 is a sounding reference signal (

) to the reference power (

) and the first transmit power compensation parameter (

) by multiplying the output signal (

) can be sent. In an exemplary embodiment, the first transmission power compensation parameter may be proportional to the internal path loss, and sequentially through the first to mth antennas 110_1 to 110_m through the compensation operation of the SRS transmission power controller 152 as described above. The output sounding reference signals may have the same or similar power to each other. On the other hand, in [Equation 2], the reference power (

) is preset and may be equally applied to all of the first to mth antennas 110_1 to 110_m.

Also, the SRS transmit power controller 152 may apply the second transmit power compensation parameter to the reference power to compensate for the transmit power of the sounding reference signal transmitted through the j-th antenna 110_j in the strong electric field. The SRS transmit power controller 152 in the strong electric field may compensate the transmit power for each antenna as follows.

[Equation 3]

[Equation 4]

)에 기준 전력(

) 및 제2 송신 전력 보상 파라미터(

)를 곱하여 제j 안테나(110_j)를 통해 출력 신호(

)를 송신할 수 있다. 제2 송신 전력 보상 파라미터(

)는 제1 송신 전력 보상 파라미터(

)와 수신 전력 보상 파라미터(

)간의 곱셈 결과값에 해당할 수 있다. 예시적 실시 예로, 수신 전력 보상 파라미터(

)는 제1 내지 제m 안테나(110_1~110_m) 각각의 수신 전력이 타겟 수신 전력을 갖도록 하기 위해 안테나별 수신 전력에 적용되는 파라미터에 해당할 수 있다. 예를 들어, 제1 안테나(110_1)에 대응하는 다운링크 채널의 상태가 제2 안테나(110_2)에 대응하는 다운링크 채널의 상태보다 좋은 때에, 셀의 복수의 안테나들로부터 출력되는 신호들의 전력 크기가 동일할지라도 다운링크 채널들을 경험한 제1 안테나(110_1)를 통해 수신되는 신호의 수신 전력은 제2 안테나(110_2)를 통해 수신되는 신호의 수신 전력보다 클 수 있다. 제1 안테나(110_1)를 통해 수신되는 신호의 수신 전력과 제2 안테나(110_2)를 통해 수신되는 신호의 수신 전력을 동일한 타겟 수신 전력으로 보상하기 위해 각각에 상이한 수신 전력 보상 파라미터가 적용될 수 있다. 예시적 실시 예로, 수신 전력 보상 파라미터는 다운링크 채널 품질에 반비례하는 값을 가질 수 있다. 정리하면, SRS 송신 전력 컨트롤러(152)는 강전계에서 안테나별 다운링크 채널 품질을 더 고려하여 안테나별 송신 전력을 보상할 수 있다.SRS transmit power controller 152 is a sounding reference signal (

) to the reference power (

) and the second transmit power compensation parameter (

) by multiplying the output signal (

) can be sent. The second transmit power compensation parameter (

) is the first transmit power compensation parameter (

) and the received power compensation parameter (

) may correspond to the result of multiplication between In an exemplary embodiment, the received power compensation parameter (

) may correspond to a parameter applied to the reception power for each antenna so that the reception power of each of the first to mth antennas 110_1 to 110_m has the target reception power. For example, when the state of the downlink channel corresponding to the first antenna 110_1 is better than the state of the downlink channel corresponding to the second antenna 110_2, the power level of signals output from the plurality of antennas of the cell Even if is the same, the reception power of the signal received through the first antenna 110_1 experiencing downlink channels may be greater than the reception power of the signal received through the second antenna 110_2 . In order to compensate the received power of the signal received through the first antenna 110_1 and the received power of the signal received through the second antenna 110_2 with the same target received power, different receive power compensation parameters may be applied to each. In an exemplary embodiment, the received power compensation parameter may have a value that is inversely proportional to the downlink channel quality. In summary, the SRS transmit power controller 152 may compensate the transmit power for each antenna by further considering the downlink channel quality for each antenna in a strong electric field.

In an exemplary embodiment, the power compensation parameter calculator 154 calculates in advance the first and second transmission power compensation parameters and the reception power compensation parameters used by the SRS transmission power controller 152 for each antenna, and sends it to the SRS transmission power controller 152 . can provide The power compensation parameter calculator 154 generates a first transmission power compensation parameter by using the internal path loss for each antenna, generates a reception power compensation parameter by using the downlink channel quality for each antenna, and includes the first transmission power compensation parameter and A second transmission power compensation parameter may be generated using the received power compensation parameter. In some embodiments, the power compensation parameter calculator 154 may store the generated first and second transmission power compensation parameters and received power compensation parameters in a memory, and periodically or aperiodically or aperiodically, the first and second transmission power compensation parameters. , the received power compensation parameter may be updated.

In an exemplary embodiment, the power compensation parameter calculator 154 may generate a received power compensation parameter based on an average path loss of a downlink channel for each antenna. The average path loss of the downlink channel for each antenna may be defined as follows.

[Equation 5]

는 제j 안테나(110_j)에 수신되는 다운링크 신호가 경험하는 다운링크 채널의 평균 경로 손실을 의미한다.

는 부반송파의 개수를 의미하고,

는 도 1b의 셀(110)의 제i 안테나와 무선 통신 장치(100)의 제j 안테나(110_j) 사이의 다운링크 채널을 의미한다. 전력 보상 파리미터 연산기(154)는 [수학식 5]와 같이 안테나별 다운링크 채널의 평균 경로 손실을 연산하고, 다운링크 채널의 평균 경로 손실에 비례하는 안테나별 수신 전력 보상 파라미터를 생성할 수 있다.

denotes an average path loss of a downlink channel experienced by a downlink signal received by the j-th antenna 110_j.

is the number of subcarriers,

denotes a downlink channel between the i-th antenna of the cell 110 of FIG. 1B and the j-th antenna 110_j of the wireless communication device 100 . The power compensation parameter calculator 154 may calculate the average path loss of the downlink channel for each antenna as shown in Equation 5, and generate a received power compensation parameter for each antenna that is proportional to the average path loss of the downlink channel.

In an exemplary embodiment, the power compensation parameter calculator 154 may generate a received power compensation parameter based on the received signal strength for each antenna. For example, the power compensation parameter calculator 154 may measure Reference Signal Received Power (RSRP) for each antenna and generate a received power compensation parameter for each antenna that is inversely proportional to the measured RSRP.

In addition to the above embodiments, the power compensation parameter calculator 154 may generate a received power compensation parameter for each antenna that is inversely proportional to the downlink channel quality in various ways.

In an exemplary embodiment, the SRS transmit power controller 152 may control a power amplifier PA included in each of the transmit circuits 134_1 to 134_m to compensate for the transmit power of a sounding reference signal for each antenna in a weak or strong electric field. can be biased. However, this is only an exemplary embodiment, and the present invention is not limited thereto, and the SRS transmit power controller 152 may compensate the transmit power of the sounding reference signal for each antenna in various ways.

The SRS transmit power controller 152 and the power compensation parameter calculator 154 included in the baseband processor 150 may be implemented in various ways, such as software or hardware, or a software/hardware mixed module. In addition, each characteristic operation of the SRS transmit power controller 152 and the power compensation parameter calculator 154 may be integrally performed by the baseband processor 150 .

3 is a block diagram illustrating the SRS transmit power controller 152 of FIG. 2 .

Referring to FIG. 3 , the SRS transmit power controller 152 may include an electric field state check circuit 152_1 , a power compensation mode selection circuit 152_2 , and a transmit power control circuit 152_3 . The electric field state check circuit 152_1 may check the electric field state of the wireless communication device using a downlink signal received from the cell. For example, the electric field state check circuit 152_1 may measure the received signal strength of a reference signal included in the downlink signal, and compare the measured received signal strength with a reference value to confirm the electric field state. Furthermore, the electric field state check circuit 152_1 may classify the electric field state of the wireless communication device in detail using various reference values.

The power compensation mode selection circuit 152_2 may select a power compensation mode for compensating for transmission power of a sounding reference signal for each antenna based on the checked electric field state of the wireless communication device. The power compensation mode selection circuit 152_2 may select a first power compensation mode for compensating the transmission power for each antenna by mainly considering the characteristics of internal noise of the wireless communication device in a strong electric field, A second power compensation mode for compensating for transmit power for each antenna may be selected by mainly considering the characteristics of noise.

When the transmit power control circuit 152_3 operates in the first power compensation mode, it transmits the sounding reference signal using the second transmit power compensation parameter generated using the first transmit power compensation parameter and the received power compensation parameter. It is possible to compensate the transmit power for each antenna. When the transmit power control circuit 152_3 operates in the second power compensation mode, the transmit power for each antenna for transmitting the sounding reference signal may be compensated by using the first transmit power compensation parameter.

4 is a flowchart illustrating an operating method of a wireless communication system according to an exemplary embodiment of the present disclosure.

Referring to FIG. 4 , the wireless communication system may include the wireless communication device 100 and the cell 110 , and in step S100 , the cell 110 may transmit a first downlink signal to the wireless communication device 100 . have. In step S110, the wireless communication device 100 may check the electric field state of the wireless communication device 100 from the first downlink signal. Specifically, the wireless communication device 100 is a reference signal included in the first downlink signal RSRP (Reference Signal Received Power), RSRQ (Reference Signal Received Quality), SINR (Signal-to-Interference-and-Noise Ratio) and Received Signal Strength Indicator (RSSI) may be measured, and it may be determined whether the wireless communication device 100 is a strong electric field or a weak electric field based on the measurement result. In step S120, the wireless communication device 100 may select a power compensation mode based on the electric field state. For example, the wireless communication device 100 may select the first power compensation mode in the strong electric field and select the second power compensation mode in the weak electric field. The reason why the wireless communication device 100 selects a different power compensation mode according to the electric field state is because internal or external noise characteristics of the wireless communication device 100 vary according to the electric field state. The wireless communication device 100 supports the cell 110 to accurately estimate the downlink channel using channel reciprocity by performing power compensation of the sounding reference signal for each antenna in consideration of internal or external noise characteristics according to the electric field state. can

In step S130, the wireless communication device may compensate the transmission power of the sounding reference signal for each antenna based on the selected power compensation mode. The wireless communication device may bias the power amplifier connected to each antenna in order to compensate for the transmission power of the sounding reference signal for each antenna. In step S140 , the wireless communication device may transmit a sounding reference signal having a compensated transmission power to the cell 110 by sequentially selecting any one of the antennas. In step S150, the cell 110 estimates an uplink channel for each antenna using a sounding reference signal sequentially received from the antennas of the wireless communication device 100, and based on the channel reciprocity from the estimated uplink channel, the antenna Each downlink channel can be estimated. In step S160, the cell 110 may calculate a beamforming matrix based on the downlink channel for each antenna, and perform beamforming based on the calculated beamforming matrix. In step S170 , the cell 110 may transmit a second downlink signal to the wireless communication device 100 based on beamforming.

5A and 5B are graphs for explaining the magnitude of noise in a strong electric field and a weak electric field of a wireless communication device. Hereinafter, the internal noise of the wireless communication device is noise generated at the receiving end, such as a mixer, ADC (Analog-Digter Converter), etc. included in the wireless communication device, and a noise component that changes depending on the received signal strength and a white noise component are combined. It could be noise. Accordingly, the internal noise may increase in proportion to the downlink channel state quality. External noise of the wireless communication device may have the same magnitude or dispersion irrespective of the antenna as thermal noise, and the external noise may increase in proportion to temperature.

Referring to FIG. 5A , since the magnitude of internal noise of the wireless communication device is relatively larger than that of external noise in a strong electric field, internal noise should be mainly considered during the transmission power compensation operation of the sounding reference signal for each antenna in the strong electric field. can The internal noise and received signal strength of the wireless communication device may be proportional to the downlink channel quality. In order for the wireless communication device to estimate the downlink channel by the cell through channel complementarity in a strong electric field, when sounding reference signals are sequentially received from the antennas of the wireless communication device to the cell, the reception power of each of the sounding reference signals Since they should be the same or similar, the wireless communication device may compensate for the transmission power of the sounding reference signal for each antenna in consideration of downlink channel state quality and internal path loss.

Referring to FIG. 5B , in the weak electric field, the external noise of the wireless communication device is relatively larger than the internal noise. Therefore, in the weak electric field, the external noise should be mainly considered during the transmission power compensation operation of the sounding reference signal for each antenna. can The wireless communication device may compensate the transmission power of the sounding reference signal for each antenna in consideration of the internal path loss so that the cell can estimate the downlink channel through channel complementarity in the weak electric field.

6 is a flowchart specifically illustrating step S110 of FIG. 4 .

Referring to FIG. 6 , in step S112 subsequent to step S100 of FIG. 4 , the wireless communication device may measure a received signal strength from a reference signal included in the first downlink signal. For example, the wireless communication device may measure a received signal strength with respect to a reference signal received for each antenna, and obtain an average value from a plurality of received signal strengths to obtain one received signal strength. In step S114, the wireless communication device may compare the measured received signal strength with a preset reference value. When step S114 is 'Yes', the wireless communication device may determine a strong electric field, and when step S114 is 'No', the wireless communication device may determine a weak electric field. Thereafter, the wireless communication device may follow step S120 of FIG. 4 .

7 is a flowchart specifically illustrating step S120 of FIG. 4 .

Referring to FIG. 7 , in step S132 following step S116 of FIG. 6 , the wireless communication device may select the first power compensation mode when there is a strong electric field. In step S134, the wireless communication device may compensate for the transmission power of the sounding reference signal for each antenna in consideration of internal noise. In step S136 following step S118 of FIG. 6 , the wireless communication device may select the second power compensation mode when the electric field is weak. In step S138, the wireless communication device may compensate for the transmission power of the sounding reference signal for each antenna in consideration of external noise. The wireless communication device may follow step S140 of FIG. 4 after step S134 or step S138.

8 is a block diagram referenced to describe a method of compensating for transmission power of a sounding reference signal for each antenna according to an exemplary embodiment of the present disclosure. Hereinafter, for convenience of description, it is assumed that the number of antennas included in the wireless communication device is three, but this is only an exemplary embodiment, and the present invention is not limited thereto. It is clear that the technical spirit of the disclosure can be applied.

Referring to FIG. 8 , the wireless communication device includes first to third power amplifiers 210_1 to 230_1 , first to third antennas 210_2 to 230_2 , an SRS transmission power controller 240 , and a power management integrated circuit 250 . may include. In an exemplary embodiment, the SRS transmit power controller 240 is configured to compensate the transmit power of the first to third sounding reference signals SRS_1 to SRS_3 transmitted through the first to third antennas 210_2 to 230_2. A management integrated circuit 250 may be used. The power management integrated circuit 250 biases each of the first to third power amplifiers 210_1 to 230_1 in response to the control signal received from the SRS transmission power controller 240 , and thereby the first to third power amplifiers 210_1 to 210_1 to 230_1) Each gain can be adjusted.

For example, in the weak electric field, the SRS transmit power controller 240 performs the first power amplifier through the power management integrated circuit 250 in consideration of the internal loss path from the first power amplifier 210_1 to the first antenna 210_2 . By biasing (210_1), the transmission power of the first sounding reference signal SRS_1 may be compensated. The SRS transmit power controller 240 biases the second power amplifier 220_1 through the power management integrated circuit 250 in consideration of the internal loss path from the second power amplifier 220_1 to the second antenna 220_2. The transmission power of the second sounding reference signal SRS_2 may be compensated. The SRS transmit power controller 240 biases the third power amplifier 230_1 through the power management integrated circuit 250 in consideration of the internal loss path from the third power amplifier 230_1 to the third antenna 230_2. The transmission power of the third sounding reference signal SRS_3 may be compensated.

In addition, in a strong electric field, the SRS transmit power controller 240 takes into account an internal loss path from the first power amplifier 210_1 to the first antenna 210_2 and a downlink channel quality corresponding to the first antenna 210_2. Transmission power of the first sounding reference signal SRS_1 may be compensated for by biasing the first power amplifier 210_1 through the management integrated circuit 250 . The SRS transmit power controller 240 considers the internal loss path from the second power amplifier 220_1 to the second antenna 220_2 and the downlink channel quality corresponding to the second antenna 220_2 to the power management integrated circuit 250 . ) through the biasing of the second power amplifier 220_1 , the transmission power of the second sounding reference signal SRS_2 may be compensated. The SRS transmit power controller 240 considers the internal loss path from the third power amplifier 230_1 to the third antenna 230_2 and the downlink channel quality corresponding to the third antenna 230_2 to the power management integrated circuit 250 . ) through the biasing of the third power amplifier 230_1 , the transmit power of the third sounding reference signal SRS_3 may be compensated.

Thereafter, the first to third antennas 210_2 to 230_2 may be sequentially selected to output the first to third sounding reference signals SRS_1 to SRS_3 in which the transmission power is compensated for in a strong electric field or a weak electric field, respectively.

Meanwhile, the method for compensating the transmission power of the sounding reference signal described in FIG. 8 is only an exemplary embodiment, and the present invention is not limited thereto, and the magnitude of the signal input to the first to third power amplifiers 210_1 to 230_1 is determined. Various compensation methods may be applied, such as compensating for transmission power of a sounding reference signal by adjusting.

9 is a table for explaining a power compensation parameter corresponding to each antenna of FIG. 8 .

8 and 9 , the power compensation parameter operator 154 ( FIG. 2 ) generates first and second transmission power compensation parameters and reception power compensation parameters corresponding to the first to third antennas 210_2 to 230_2 . can do.

_{The power compensation parameter calculator 154 ( FIG. 2 ) generates the first transmission power compensation parameters PM TX1,1} to PM _TX1,3 according to the internal path loss corresponding to each of the first to third antennas 210_2 to 230_2 ). can do. In an exemplary embodiment, the first transmission power compensation parameters PM _TX1,1 to PM _TX1,3 may have a value proportional to the internal path loss corresponding to each of the first to third antennas 210_2 to 230_2.

_{The power compensation parameter calculator 154 (FIG. 2) generates the received power compensation parameters PM RX,1} to PM _RX,3 according to the downlink channel quality corresponding to each of the first to third antennas 210_2 to 230_2. can The reception power compensation parameters PM _RX,1 to PM _RX,3 may have a value inversely proportional to the downlink channel quality corresponding to each of the first to third antennas 210_2 to 230_2 .

The power compensation parameter calculator 154 ( FIG. 2 ) may generate a second transmission power compensation parameter by using the first transmission power compensation parameter and the reception power compensation parameter. Specifically, the power compensation parameter calculator 154 ( FIG. 2 ) includes a first transmission power compensation parameter ((PM _TX1,1 ~ PM _TX1,3 ) and reception power corresponding to each of the first to third antennas 210_2 to 230_2 ). Each of the compensation parameters PM _RX,1 to PM _RX,3 may be multiplied to generate a second transmission power compensation parameter PM _TX2,1 to PM _{TX2,3 .}

The SRS transmit power controller 240 may compensate the transmit power of the first to third sounding reference signals SRS_1 to SRS_3 through the power management integrated circuit 250 with reference to the table. The table may be stored in a predetermined memory in the wireless communication device, and the power compensation parameter calculator 154 ( FIG. 2 ) may periodically or aperiodically update the table.

FIG. 10 is a flowchart for specifically explaining the operation of the power compensation parameter calculator 154 of FIG. 2 .

2 and 10 , in step S200 , the power compensation parameter calculator 154 may acquire downlink channel related information for each antenna. Specifically, the power compensation parameter 154 may estimate a downlink channel for each antenna using a pilot signal received from each of the first to mth antennas 110_1 to 110_m, and the estimated downlink for each antenna. The quality of the downlink channel can be recognized through the link channel. In step S210 , the power compensation parameter calculator 154 may calculate a received power compensation parameter for each antenna by using the downlink channel related information for each antenna.

11 is a block diagram illustrating a wireless communication system 30 according to an exemplary embodiment of the present disclosure. Hereinafter, the description will be made on the assumption that the wireless communication device 300 operates only in the second power compensation mode in all electric field states.

Referring to FIG. 11 , the wireless communication system 30 may include a wireless communication device 300 and a cell 310 . The wireless communication device 300 may include first to mth antennas 306_1 to 306_m. The cell 310 may include a downlink channel estimator 312 , a beamforming processor 314 , and first to n-th antennas 316_1 to 316_n.

The downlink channel estimator 312 may estimate a downlink channel for each antenna of the wireless communication device from the uplink signal received from the wireless communication device 300 . In an exemplary embodiment, the uplink signal may include sounding reference signals sequentially transmitted from the first to mth antennas 306_1 to 306_m, and the downlink channel estimator 312 uses the sounding reference signals to The uplink channel for each antenna of the wireless communication device 300 is estimated, and the downlink channel for each antenna of the wireless communication device 300 is estimated from the uplink channel for each antenna of the wireless communication device 300 estimated based on channel reciprocity. or can be obtained.

The downlink channel estimator 312 may include an electric field state check circuit 312a and an estimation channel adjustment circuit 312b. The electric field state check circuit 312a may check the electric field state of the wireless communication device 300 . In an exemplary embodiment, the electric field state check circuit 312a checks the electric field state of the wireless communication device 300 using channel state information of the wireless communication device 300 included in the uplink signal, or The electric field state of the wireless communication device 300 may be checked using the uplink power control command transmitted to the wireless communication device 300 . Furthermore, the electric field state check circuit 312a uses the sounding reference signals sequentially transmitted from the first to mth antennas 306_1 to 306_m of the wireless communication device 300 to determine the electric field state of the wireless communication device 300 . can be checked.

The estimation channel adjustment circuit 312b may adjust the estimated downlink channel for each antenna of the wireless communication device 300 based on the electric field state of the wireless communication device 300 confirmed by the electric field state checking circuit 312a. In an exemplary embodiment, the estimation channel adjustment circuit 312b may adjust the estimated downlink channel for each antenna of the wireless communication device 300 only when the electric field state of the wireless communication device 300 is a strong electric field. That is, in the strong field, the transmission powers of the sounding reference signals transmitted through the first to mth antennas 306_1 to 306_m, respectively, are the same or similar to each other, but are received by the cell 310 after experiencing the uplink channel for each antenna. The received powers of the sounding reference signals may be different according to the quality of an uplink channel for each antenna. That is, the received powers of the sounding reference signals received by the cell 310 may vary depending on the quality of the uplink channel for each antenna. Considering this, the downlink channel for each antenna estimated by the downlink channel estimator 312 . can be adjusted to generate a downlink equivalent channel for each antenna when sounding reference signals received by the cell 310 have the same or similar reception power.

In an exemplary embodiment, the estimation channel adjustment circuit 312b calculates a bundle unit average of downlink channels for each antenna of the wireless communication device 300 when the electric field state of the wireless communication device 300 is a strong field, A downlink channel for each antenna may be adjusted using a bundle unit average of downlink channels for each antenna.

In an exemplary embodiment, the operation of the estimation channel adjustment circuit 312b may be expressed as follows.

[Equation 6]

은 셀(310)의 제i 안테나(316_i)와 무선 통신 장치(300)의 제j 안테나(306_j) 사이의 다운링크 채널을 의미하고,

는

가 조정되어 생성된 셀(310)의 제i 안테나(316_i)와 무선 통신 장치(300)의 제j 안테나(306_j) 사이의 다운링크 등가 채널을 의미할 수 있다. 번들은 빔 포밍 프로세서(314)에서 빔 포밍 매트릭스를 결정하는 주파수 단위일 수 있다. 구체적으로, 번들은 동일한 프리코딩이 수행되고, 인터리빙되는 복수의 자원 엘리먼트들을 포함하는 최소 단위로 정의될 수 있다.

는 k번째 번들을 의미하고,

는 k번째 번들에 속한 f번째 부반송파에서의 다운링크 채널을 의미할 수 있다.

는 k번째 번들에 속한 부반송파의 개수를 의미할 수 있다.

denotes a downlink channel between the i-th antenna 316_i of the cell 310 and the j-th antenna 306_j of the wireless communication device 300,

is

may mean a downlink equivalent channel between the i-th antenna 316_i of the cell 310 and the j-th antenna 306_j of the wireless communication device 300 generated by adjusting . A bundle may be a frequency unit that determines a beamforming matrix in the beamforming processor 314 . Specifically, a bundle may be defined as a minimum unit including a plurality of interleaved resource elements on which the same precoding is performed.

means the kth bundle,

may mean a downlink channel in the f th subcarrier belonging to the k th bundle.

may mean the number of subcarriers belonging to the k-th bundle.

)에 번들 단위의 평균 다운링크 채널의 역수(

)를 곱하여 안테나별 등가 다운링크 채널(

)을 생성할 수 있다.The estimation channel adjustment circuit 312b calculates the downlink channel for each antenna estimated based on [Equation 6] (

) to the reciprocal of the average downlink channel in bundles (

) multiplied by the equivalent downlink channel per antenna (

) can be created.

On the other hand, in a general fading channel environment, performance degradation may be caused because power fluctuations for each frequency domain are large, and the estimation channel adjustment circuit 312b provides frequency- A power planarization operation may be performed.

In an exemplary embodiment, the estimation channel adjustment circuit 312b may perform power adjustment on the uplink signal received from the j-th antenna 306_j as follows.

[Equation 7]

는 제j 안테나(306_j)로부터 수신된 업링크 신호에 대한 전력 조정을 위한 파라미터를 의미하고,

은 번들의 총 개수를 의미할 수 있다.

는 주파수 전영역에 대한

의 평균을

에 대응하는 주파수 영역에서의

의 평균과 번들의 총 개수의 곱으로 나누어 도출될 수 있다. 추정 채널 조정 회로(312b)는

를 포함한 모든 번들에 대한 파라미터들을 생성하고, 이를 기반으로 주파수-파워 평탄화 동작을 수행할 수 있다.

Means a parameter for power adjustment for the uplink signal received from the j-th antenna 306_j,

may mean the total number of bundles.

is for the entire frequency range

the average of

in the frequency domain corresponding to

It can be derived by dividing by the product of the mean of and the total number of bundles. The estimation channel adjustment circuit 312b is

It is possible to generate parameters for all bundles including , and perform a frequency-power flattening operation based on them.

12 is a flowchart illustrating an operating method of a wireless communication system according to an exemplary embodiment of the present disclosure.

Referring to FIG. 12 , the wireless communication system may include a wireless communication device 300 and a cell 310 , and in step S300 , the wireless communication device 300 may transmit an uplink signal to the cell 310 . The uplink signal may include sounding reference signals respectively transmitted from different antennas from the wireless communication device 300 . In step S310 , the cell 310 may estimate a downlink channel for each antenna of the wireless communication device 300 by using the sounding reference signals included in the uplink signal. Specifically, the cell 310 estimates an uplink channel for each antenna of the wireless communication device 300 based on sounding reference signals, and the wireless communication device 300 from the estimated uplink channel for each antenna in consideration of channel reciprocity. It is possible to obtain a downlink channel for each antenna of In step S320 , the cell 310 may check the electric field state of the wireless communication device 300 . The uplink signal may include channel state information transmitted from the wireless communication device 300 . The channel state information may include RSRP, RSSI, etc. measured by the wireless communication device 300 , and the cell 310 may check the electric field state of the wireless communication device 300 using the channel state information and the like. In step S330 , the cell 310 may adjust a downlink channel for each antenna estimated of the wireless communication device 300 based on the electric field state of the wireless communication device 300 . In step S340 , the cell 310 may calculate a beamforming matrix using the downlink channel for each antenna adjusted by the wireless communication device 300 . In step S350 , the cell 310 may generate a downlink signal by using the calculated beamforming matrix and transmit it to the wireless communication device 300 through a plurality of antennas of the cell 310 .

FIG. 13 is a diagram for explaining the operation of the estimation channel adjustment circuit 312b of FIG. 11 . The bundles illustrated in FIG. 13 are merely exemplary embodiments, and the present disclosure is not limited thereto, and the technical spirit of the present disclosure may be applied to various bundle implementations.

Referring to FIG. 13 , the wireless communication device 300 transmits sounding reference signals in the frequency domain corresponding to the first to fourth bundles BD_1 to BD_4 to the cell 310 through the j-th antenna 306_j. can The first bundle BD_1 includes first and second resource element groups REG_1 and REG_2, and the second bundle BD_2 includes third and fourth resource element groups REG_3 and REG_4, and a third The bundle BD_3 may include fifth and sixth resource element groups REG_5 and REG_6 , and the fourth bundle BD_4 may include seventh and eighth resource element groups REG_7 and REG_8 .

The cell 310 may estimate a downlink channel between the cell 310 corresponding to the j-th antenna 306_j and the wireless communication device 300 using the sounding reference signal. When the wireless communication device 300 is in a strong electric field, the estimation channel adjustment circuit 312b may calculate a bundle-by-bundle average for the estimated downlink channel and adjust the estimated downlink channel using the bundle-by-bundle average. For example, the estimation channel adjustment circuit 312b calculates a first channel average corresponding to the first bundle BD_1 , and uses the first channel average for the estimated downlink channel corresponding to the first bundle BD_1 . can be adjusted by In this way, the estimation channel adjustment circuit 312b calculates the average of the second to fourth channels corresponding to the second to fourth bundles BD_2 to BD_4 and to the second to fourth bundles BD_2 to BD_4. The corresponding estimated downlink channels may each be adjusted using the second to fourth channel averages.

14 is a block diagram illustrating an electronic device 1000 supporting a transmission power compensation function of a sounding reference signal according to an exemplary embodiment of the present disclosure.

Referring to FIG. 14 , the electronic device 1000 includes a memory 1010 , a processor unit 1020 , an input/output control unit 1040 , a display unit 1050 , an input device 1060 , and a communication processing unit 1090 . may include Here, a plurality of memories 1010 may exist. A look at each component is as follows.

The memory 1010 may include a program storage unit 1011 that stores a program for controlling the operation of the electronic device and a data storage unit 1012 that stores data generated during program execution. The data storage unit 1012 may store data necessary for the operation of the application program 1013 and the SRS transmission power control program 1014 . The program storage unit 1011 may include an application program 1013 and an SRS transmission power control program 1014 . Here, the program included in the program storage unit 1011 may be expressed as an instruction set as a set of instructions.

The application program 1013 may include an application program operating in the electronic device. That is, the application program 1013 may include instructions of an application driven by the processor 1022 .

The processor 1022 may execute the SRS transmit power control program 1014 to compensate the transmit power for each antenna of the electronic device 1000 for transmitting the sounding reference signal according to exemplary embodiments of the present disclosure. That is, the processor 1022 executes the SRS transmission power control program 1014 to select a power compensation mode based on the electric field state of the electronic device 1000, and transmits the sounding reference signal based on the selected power compensation mode. It is possible to compensate the transmit power for each antenna.

The electronic device 1000 includes a communication processing unit 1090 that performs a communication function for voice communication and data communication, and the communication processing unit 1090 includes the processor 1022 to compensate the transmission power for each antenna described above in FIG. 1 and the like. ) may include a transmit power control circuit 1092 controlled by The memory interface 1021 may control access to the memory 1010 of a component such as the processor 1022 or the peripheral device interface 1023 . The peripheral device interface 1023 may control the connection between the input/output peripheral device of the base station and the processor 1022 and the memory interface 1021 .

The input/output control unit 1040 may provide an interface between an input/output device such as the display unit 1050 and the input device 1060 and the peripheral device interface 1023 . The display unit 1050 displays status information, input text, a moving picture, a still picture, and the like. For example, the display unit 1050 may display application program information driven by the processor 1022 .

The input device 1060 may provide input data generated by selection of the electronic device to the processor unit 1020 through the input/output controller 1040 . In this case, the input device 1060 may include a keypad including at least one hardware button and a touch pad for sensing touch information. For example, the input device 1060 may provide touch information, such as a touch sensed through a touch pad, a touch movement, and a touch release, to the processor 1022 through the input/output controller 1040 .

Although the present invention has been described with reference to the embodiment shown in the drawings, which is merely exemplary, those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Accordingly, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

Claims (20)

A method of operating a wireless communication device for performing wireless communication with a cell, the method comprising:
checking an electric field state from a downlink signal received from the cell;
selecting a power compensation mode for transmission power of a sounding reference signal based on the identified electric field state;
compensating for transmit power for each antenna for transmitting the sounding reference signal based on the selected power compensation mode; and
and transmitting the sounding reference signal to the cell sequentially for each antenna based on the compensated transmission power for each antenna. According to claim 1,
The step of checking the electric field state,
measuring a received signal strength from the downlink signal;
determining whether the measured received signal strength exceeds a reference value for the electric field state information; and
and confirming the electric field state as any one of a strong electric field and a weak electric field based on the determination result. According to claim 1,
The power compensation mode is,
a first power compensation mode in which, when the electric field state is confirmed as a strong electric field, the transmission power for each antenna is compensated for in consideration of the characteristics of internal noise of the wireless communication device; and
and a second power compensation mode for compensating the transmission power for each antenna by mainly considering the characteristics of external noise of the wireless communication device when the electric field state is confirmed as a weak electric field; . According to claim 1,
Compensating the transmit power for each antenna when the power compensation mode is selected as the first power compensation mode corresponding to the strong electric field comprises:
generating a second transmission power compensation parameter by using a first transmission power compensation parameter corresponding to an internal path loss for each antenna of the wireless communication device and a reception power compensation parameter corresponding to a downlink channel state for each antenna of the wireless communication device step; and
and applying the second transmit power compensation parameter to the transmit power for each antenna. 5. The method of claim 4,
The first transmit power compensation parameter has a value proportional to the internal path loss,
The method of operating a wireless communication device, characterized in that the received power compensation parameter has a value inversely proportional to the downlink channel quality. 6. The method of claim 5,
The generating of the second transmission power compensation parameter comprises:
and generating the second transmission power compensation parameter by multiplying the first transmission power compensation parameter and the reception power compensation parameter. 5. The method of claim 4,
The received power compensation parameter is,
The method of operating a wireless communication device, characterized in that it is determined based on a path loss of a downlink channel for each antenna in order to make the reception power for each antenna uniform. 5. The method of claim 4,
The received power compensation parameter is,
The method of operating a wireless communication device, characterized in that determined based on the RSRP measured for each antenna in order to uniform the received power for each antenna. According to claim 1,
Compensating the transmit power for each antenna when the power compensation mode is selected as the second power compensation mode corresponding to the weak electric field comprises:
generating a first transmission power compensation parameter corresponding to an internal path loss for each antenna of the wireless communication device; and
and applying the first transmit power compensation parameter to transmit power for each antenna. According to claim 1,
The wireless communication device includes a plurality of antennas and a plurality of power amplifiers connected to each of the plurality of antennas,
Compensating the transmit power for each antenna comprises:
and adjusting a bias of each of the plurality of power amplifiers to compensate for the transmit power for each antenna. According to claim 1,
Compensating the transmit power for each antenna comprises:
and compensating for the transmission power for each antenna by using the maximum output power of the wireless communication device as a limit value. A method of operating a cell for performing wireless communication with a wireless communication device, the method comprising:
estimating a downlink channel for each antenna of the wireless communication device from the uplink signal received from the wireless communication device;
checking an electric field state of the wireless communication device;
adjusting the estimated downlink channel for each antenna based on the identified electric field state;
calculating a beamforming matrix based on the adjusted downlink channel for each antenna; and
and transmitting a downlink signal generated based on the calculated beamforming matrix to a wireless communication device. 13. The method of claim 12,
The step of checking the electric field state of the wireless communication device,
The method of operating a cell, characterized in that the electric field state is confirmed by using downlink channel state related information included in the uplink signal. 13. The method of claim 12,
Adjusting the estimated downlink channel for each antenna comprises:
calculating a bundle unit average of downlink channels for each antenna when the checked electric field state is a strong electric field; and
and adjusting the downlink channel for each antenna by using the bundle unit average of the downlink channel for each antenna. A method of operating a wireless communication system comprising a cell and a wireless communication device that communicate with each other, the method comprising:
The wireless communication device, the step of checking the electric field state from the downlink signal received from the cell;
When the checked electric field state is a strong electric field, the wireless communication device generates a second transmission power compensation parameter corresponding to an internal path loss for each antenna and a received power compensation parameter corresponding to a downlink channel state for each antenna. 2 compensating for transmit power for each antenna for transmitting a sounding reference signal using a transmit power compensation parameter; and
and transmitting, by the wireless communication device, the sounding reference signal to the cell based on the compensated transmission power for each antenna. 16. The method of claim 15,
and compensating, by the wireless communication device, the transmission power for each antenna using the first transmission power compensation parameter when the checked electric field state is a weak electric field. 16. The method of claim 15,
The first transmit power compensation parameter has a value proportional to the internal path loss,
The received power compensation parameter, the method of operating a wireless communication system, characterized in that having a value inversely proportional to the downlink channel state. 16. The method of claim 15,
estimating, by the cell, a downlink channel for each antenna based on a sounding reference signal received from the wireless communication device; and
calculating, by the cell, a beamforming matrix based on the estimated downlink channel for each antenna; and
The method of operating a wireless communication system, characterized in that the cell, further comprising the step of transmitting a downlink signal generated based on the calculated beamforming matrix to the wireless communication device. 16. The method of claim 15,
The step of checking the electric field state,
measuring a received signal strength from the downlink signal;
determining whether the measured received signal strength exceeds a reference value;
The method of operating a wireless communication system according to claim 1, further comprising: confirming the electric field state as one of the strong electric field and the weak electric field based on the determination result. 20. The method of claim 19,
The received signal strength is,
RSRP, SCH_RP (Synchronization_Recieved Power), RSRQ (Reference Signal Received Quality), SINR (Signal-to-Interference-and-Noise Ratio), and RSSI (Received Signal Strength Indicator) wireless communication system comprising at least one of how it works.

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